Datasheet

REV. 0
AD7708/AD7718
–21–
Table VII. Typical Output RMS Noise vs. Input Range and Update Rate for AD7718 with Chop Disabled (CHOP = 1);
Output RMS Noise in ␮V
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
03 1365.33 30.31 29.02 58.33 112.7 282.44 361.72 616.89 1660
13 315.08 2.47 2.49 2.37 3.87 7.18 12.61 16.65 32.45
66 62.06 0.743 0.852 0.9183 0.8788 0.8795 1.29 1.99 3.59
69 59.38 0.961 0.971 0.949 0.922 0.923 1.32 2.03 3.73
81 50.57 0.894 0.872 0.872 0.806 0.793 1.34 2.18 2.96
255 16.06 0.475 0.468 0.434 0.485 0.458 0.688 1.18 1.78
Table VIII. Peak-to-Peak Resolution vs. Input Range and Update Rate for AD7718 with Chop Disabled (CHOP = 1);
Peak-to-Peak Resolution in Bits
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
03 1365.33 8999 9 9 9 9
13 315.08 11 12 14 14 14 14 15 15
66 62.06 13 14 15 16 17 17 18 18
69 59.36 13 14 15 16 17 17 18 18
81 50.57 13 14 15 16 17 17 18 18
255 16.06 14 15 16 17 18 18 19 19
Table IX. Typical Output RMS Noise vs. Input Range and Update Rate for AD7708 with Chop Disabled (CHOP = 1);
Output RMS Noise in ␮V
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
03 1365.33 30.31 29.02 58.33 112.7 282.44 361.72 616.89 1660
13 315.08 2.47 2.49 2.37 3.87 7.18 12.61 16.65 32.45
66 62.06 0.743 0.852 0.9183 0.8788 0.8795 1.29 1.99 3.59
69 59.38 0.961 0.971 0.949 0.922 0.923 1.32 2.03 3.73
81 50.57 0.894 0.872 0.872 0.806 0.793 1.34 2.18 2.96
255 16.06 0.475 0.468 0.434 0.485 0.458 0.688 1.18 1.78
Table X. Peak-to-Peak Resolution vs. Input Range and Update Rate for AD7708 with Chop Disabled (CHOP = 1);
Peak-to-Peak Resolution in Bits
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
03 1365.33 8999 9 9 9 9
13 315.08 11 12 14 14 14 14 15 15
66 62.06 13 14 15 16 16 16 16 16
69 59.36 13 14 15 16 16 16 16 16
81 50.57 13 14 15 16 16 16 16 16
255 16.06 14 15 16 16 16 16 16 16